Organization and Description of Business - Restricted Cash and Allowance for Doubtful Accounts (Details) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Restricted Cash
Cash reserved to cover liabilities associated with Merger	$ 120,000	$ 118,000
Long term deposit consisting of letter of credit serving as security for lease	603,000	603,000
Headquarters and laboratory facility, South San Francisco, Lease expiring 2016
Restricted Cash
Cash reserved to cover liabilities associated with Merger	120,000	118,000
Headquarters and laboratory facilities, South San Francisco, Lease signed April 2015
Restricted Cash
Long term deposit consisting of letter of credit serving as security for lease	$ 603,000	$ 603,000

The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant